SYSTEM AND METHOD FOR CELL BALANCING AND CHARGING
First Claim
1. An apparatus for charging a plurality of series connected battery cells, comprising:
- first and second input terminals for providing a charging voltage to the plurality of series connected battery cells;
a transformer including a primary side associated with the charging voltage and a secondary side including a plurality of portions, each of the plurality of portions connected across at least two of the plurality of series connected battery cells;
a first switch in series between each of the plurality of portions of the secondary side and a first battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the first battery cell during a first portion of a cycle of a current in the primary side of the transformer; and
a second switch in series between each of the plurality of portions of the secondary side and a second battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the second battery cell during a second portion of the cycle of the current in the primary side of the transformer.
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Accused Products
Abstract
An apparatus for charging a plurality of series connected battery cells includes first and second input terminals for providing a charging voltage to the plurality of series connected battery cells. A transformer includes a primary side associated with the charging voltage and a secondary side including a plurality of portions. Each of the plurality of portions connected across at least two of the plurality of series connected battery cells. A first switch in series between each of the plurality of portions of the secondary side and a first battery cell of the at least two of the plurality of series connected battery cells provides a charging current to the first battery cell during a first portion of a cycle of a current in the primary side of the transformer. A second switch in series between each of the plurality of portions of the secondary side and a second battery cell of the at least two of the plurality of series connected battery cells provides a charging current to the to the second battery cell during a second portion of the cycle of the current in the primary side of the transformer.
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Citations
20 Claims
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1. An apparatus for charging a plurality of series connected battery cells, comprising:
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first and second input terminals for providing a charging voltage to the plurality of series connected battery cells; a transformer including a primary side associated with the charging voltage and a secondary side including a plurality of portions, each of the plurality of portions connected across at least two of the plurality of series connected battery cells; a first switch in series between each of the plurality of portions of the secondary side and a first battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the first battery cell during a first portion of a cycle of a current in the primary side of the transformer; and a second switch in series between each of the plurality of portions of the secondary side and a second battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the second battery cell during a second portion of the cycle of the current in the primary side of the transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for charging a plurality of series connected battery cells, comprising:
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first and second input terminals for providing a charging voltage to the plurality of series connected battery cells; a transformer including a primary side associated with the charging voltage and a secondary side including a plurality of portions, each of the plurality of portions connected across at least two of the plurality of series connected battery cells; a first diode in series between each of the plurality of portions of the secondary side and a first battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the first battery cell during a first portion of a cycle of a current in the primary side of the transformer; and a second diode in series between each of the plurality of portions of the secondary side and a second battery cell of the at least two of the plurality of series connected battery cells for providing a charging current to the to the second battery cell during a second portion of the cycle of the current in the primary side of the transformer. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for charging a plurality of series connected battery cells, comprising the steps of:
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receiving a charging voltage for the plurality of series connected battery cells; transferring the charging voltage from a primary side of a transformer to a plurality of portions of a secondary side; charging a first half of the plurality of series connected battery cells using the plurality of portions of the secondary side during a first portion of a cycle of a current in the primary side of the transformer; and charging a second half of the plurality of series connected battery cells using the plurality of portions of the secondary side during a second portion of a cycle of a current in the primary side of the transformer. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification